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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c7a2a0483a0f531e375c3d32b83d21f149974a3a8e687738326b9cd8ba3351c' 
  AND token = 'MHVj98EmngZaqs1hmxYS8cSlMrWM3tjJDgPGblbRyw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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