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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a149485d38c4f7b1e558528d3e59b5c7bf88daa4da62b4399764dac3d3b614e' 
  AND token = '3hpysEcSNoITqyJ5O673GV5OpFjQR0zaToI8uO5zVrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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