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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0218559e904792cd0b16d57b16ac56636ad0bd2e3a3ea047a997555f15c1b268' 
  AND token = 'cdH0hBU297HE6RP58jX+OttwFzMNxsH13U9bJhMePXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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