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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '072a834f44b1f89a6caf9cf9a97d8db2f19f934b9f167d10f0a6a4cea4b0bcba' 
  AND token = '3sDhU/m+8GKrNCqCymi2X+FbQVPLLdhGigawnUyEmMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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