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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7948cec1e3c0643372c7bcd4af2e16950830683da37edac3423ce4a498b30e5a' 
  AND token = 'efki6vl3C+14v4eL8t3nOqKTUX23LcvZztbDpdBvUhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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