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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b2013ff05ea6313301f6d143582835a33910a2fe512384dbd1ddc5099bbc6b1' 
  AND token = '62WiZcRrMbEt9Iq154dFiUQJzIY6kEyu21G+b5zCUoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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