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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f348399c486af15c6fad779b4735e3dbd2c155e91fad9ff37007b4bcea350e9' 
  AND token = 'c1XJQpyJmi7tbACD7LBCWl63J9XrB2pyjGdVaG3oEqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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