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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad26f60408753eec3bc18d4d0ce35c7b31e83ed287a2814040aae0e0af91bc08' 
  AND token = 'AJDHZa0varczl733e/HS5eRpdAxQZW8zXkoH2iISL88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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