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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0db781e83bc9323aef17aff2991b2aeaf1ea86604d88f3874f26024b8f0bcf07' 
  AND token = 'SZLRlyjCU1s02q0C6ZOcNscLtU0/GT39rh9X46WiDrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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