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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acca2f04c02154cf73d17b11b7b0f9019c54a7bd83cffcf1fdb122d34cb3ac42' 
  AND token = 'hLx84KA3Y1M6Wav0IKlg8QQgFK0UbC8cMY3JWF/rPdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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