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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a09f94485454fab6b073a40a94be621cebf6a6f06080c3325a21585de23d3b4' 
  AND token = 'a05buOOBYjehEqBdkSEa4O9w3AuMoLJDgrkYbChz3Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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