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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '012490a7b29584a733268a5b99d6acd8e45d189ab8324389939af4c8f4db20bf' 
  AND token = 'K/ox4nxcHZHWUMIueAAJoFsE4dy8p2/VP0+UMpaccnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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