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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c4d15e39d5463e5540522ca0291d7335af520c569c73297cd50ee732f02b7c6' 
  AND token = 'mdc0QHAQ1BHcrG8o3AKlJsBabQCQvKofa+MCbO13RiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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