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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90e13483f8665b4151fb2a16ce0e034bbbcc7af65a04befbc074c3ca9788567c' 
  AND token = 'kNsW88LTPG/XHo0Vgc9agB0N8Y02yoGRYZftrzmvBCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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