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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e17fef884307eba11c2c06b9c92d12d0a9eb680fc3bbd3f0f56026d8b0d839b' 
  AND token = 'QQzpo2wp7R/3WoU1aONgSGYmXqamqLztzqPI0Pd7+7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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