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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4abd0e068a99b5f2c6b01319296e9deaf94acdd2aa47812a0d32c72d7ea43c4' 
  AND token = '+BAhPbkaYSFXaIlJI9GkJh97EOwviBQ0kjvARFQbhpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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