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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c06d6099cf397cc7cf4dd340eabb1debe6a9fa323f2aa45460eecc2087831723' 
  AND token = 'QnYww7LJjC73jTNiLHXI6CUaBLOe8eYbohGt8b/IHSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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