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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63a73f8f3c5334243b12c8e8fe831e6bc0d457c3c1ff0b9f6c35d64a231c6d86' 
  AND token = 'GboOEM/KkNDmucMhZQ3pUZu+hEaSbrYg9jyiscc9sfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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