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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca0a05b0f223b5d12c7c20a4ded58b0fd8e683e49aa12639396829b8529616b0' 
  AND token = '5iS/sc3a69GkFcTtkmrYOwGX6x1gzDlXJDCd/GuJSzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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