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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd99b26af4e3040f2fdde8b1b30cef0d99d3333ed369b8d99b780af74dac624a8' 
  AND token = 'mLTSSiPhtZVgppmiIvSRbYQqCUZ/XehgEkvB/iA03VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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