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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21f33b00eb5f6a4750bba2af9bda6d2315560410e23ca1da459821157bb59bf3' 
  AND token = 'cqh1JfSX3oxL0mSnMwNIY84mladiJOC6H939fYHF0jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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