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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da0eaf1044429f35307cec4cfebdf35a6161a9716b25fb7653b7ad26e8849774' 
  AND token = 'XS0dF8/k2cFLa1VN03xObgzkfIeSAz0jz8V06mZtibc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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