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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e8511533761d267e1d10720c7d50a7566614faf695ba56e795412091a853dbd' 
  AND token = 'nqJ8AftNwq9BPr4Y9scg1/7J3ihy2l5gQrJqP860ne8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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