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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '450e959fbbe425780bdee5c9a9d9532364d47c132a1dcb8a6dc98df3bb05817c' 
  AND token = '2UN8PeGnmi74ENADodJmEAnPSEo2nrQu9uR9681m3pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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