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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2feae14f145b76fbbc041371251996a4f2bb0d399325b1e5f29cf948246499d4' 
  AND token = 'LCfgHNTqBwF6PR3d25QPU3TLyJcILoxvtiJHCfKXUc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}