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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecdb3ec3811673a558f9ae82c9c5a33113675c01ff4ffcb27c8ba3b24334b700' 
  AND token = 'NJ/9tC3waSQFctKgZMm8G6h7oB23qEoSXMpJnyNeKF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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