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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0db86e08aef4408c3f8747697f7ba2a34fcea1fae28d9c2c7cde9cb2f1cb333' 
  AND token = 'wodp+9aUIWP5cLoAcyQDy+Pu3du7J//lwIy+qBT1gXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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