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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6b597e244584abbdc57abb373b21a7f530aa94c53f0f1b92b76c544ba336aad' 
  AND token = '5yEa1sxufVVmp5zKWo1G633TYVXKCVbYsM5dqKSqWwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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