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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bedb4303f4c4d0dc5a7e26c9438f9429cf78d74225460ac068027928ec5432b' 
  AND token = '/S9E0iGroEMRMndhfrF7bUPGvvDOxhFgbSt2yusIt/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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