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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1e694b3162bc2882ea772f55acf549d405a0a4747188de1b14fdc3e48be2835' 
  AND token = 'zoXUq6MW6gVpo2Idl1hXwRbn0p6is1T8skdTOb7uFNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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