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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c40e5ad82708f7505add07b1a6db00814ae06c739ab7d5faf65cc802c9c11b5' 
  AND token = 'aEamHy5v3SGOcGve0KGdsAbEKsWvP+msjm3WMduHCw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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