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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e02740fbd8189d12be1a507307b0ca20d6eb2c686f1e443e7967ab65f048ad3' 
  AND token = 'ZtXNO8e74086bvJWh1Baih2XY1dlsAWcqo7czZOGwGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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