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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89c58c2ddca2d490e967959b935983c36cb444c167b63b01b35976caa6989f7f' 
  AND token = 'h0me2h/AzrGH8C7++iA/m8imF4cw7RNpdMZXodjPr2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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