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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d02df8050daf38db5d92e068139f0706195f887796a24de38d02a78e01352d6' 
  AND token = 'QY6fbbqJ2p6SV27lZFat0/lVls4QNu+3K/2iS6z36Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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