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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '923b6ebe38988d12bc3ab26893f252058f82a84ee11ffde76eac4f1593e63112' 
  AND token = 'cWIR7V+OXzpGzf+3sGdCASEq2AtNiIVbp1nxt8RIFHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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