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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93714c2deec0751b7de319c3211c99f8a93a0d03838c8c63ec6c05495cce3740' 
  AND token = '8F9HKQZTYHtUl/lbfNm4wtYob9ijVtS1N60Qo7qp9gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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