SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7fb00e324301459c7548b80d5d84b5a52a061d5e04731e6de8aaea239103b99' 
  AND token = 'RdPxtR9ekXyGxYwTqgeqBaQCHgMlj+fy4mLPPzH8GQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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