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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92566c997c15b1c81959f04dfa0a70b5302f2f9af8845c0f94b325c6c84fe03e' 
  AND token = 'r5ahe8OlSbJTKrIfAUiaQ6JmtbYcbq4OGTaq1VcHbhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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