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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26bb97f0fae4325be1af16fed0e0a554433b96322b9b4e173c3e8b1e32b5fbe3' 
  AND token = 'XFJMfpJMznkqYaK6yk2ZxuvtcSGG7Fet9PVVu1/mUPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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