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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f5ee5070ae78fd2edfe97063a6e762c2d608464abe680e88af55f2aaf7479a2' 
  AND token = 'oMDY1n8zZJT3H58ThcEgobTw51LoPIzwecO/usd7so8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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