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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc71ee7f7331ed5ca5a47341ff94616404a9b745ed61c680319ea678df049299' 
  AND token = '5V23eXq0X0zHCuHxI4c4HjzfK7XxXkX2WKa5Bw/ooNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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