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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44eae45d067b7954274e429d7189f90f94cea3cc5ae48e311732ea358260e580' 
  AND token = '0PFBttAdz2knWJY5OqQ7UoPe9fZy3DAEGcpVglNwjN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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