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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e645c5e00b72198c3607afb6dacdd2934d8f3bdcafff67cbee22fc77c245d4c6' 
  AND token = 'zDgtAQdjPYHmkAUyP29bN8Y0P5Z7Mb1k/Qgkt+u03+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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