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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a98c055125a0ca2d91f0534579f3e8384a5c4c54e0486b68cd041baf2f8355b2' 
  AND token = '2SZ0Lix+lyH4G1oKRjLI/EiOH0ybb7eppjwjgrn/+wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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