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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7c71075cddadee649ded2db19637449fa1fec017ad4044a4f7ba31c90f898c0' 
  AND token = 'GN5tM0CEhVoBdk5PqpgTGtNrMAQDO9Z+SEdErrgUxwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00272

JSON explain

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